FIG. 4.

Concentration dependence of Ca²⁺–DPA-induced germination. Mutant spores from strain FB85 were heat activated, incubated in various concentrations of Ca²⁺–DPA for 1 h at room temperature, plated on LB agar, and incubated overnight at 37°C prior to colony counting. The titer of germinated spores was plotted against [Ca²⁺–DPA].